Got an extreme on the front of my 29er. Not as light as the old Maxxis Ardent but way better grip on everything short of slop. Its not a mud tyre just a good all rounder, pity about the sh1tty graphics though look like an advert for a cheap fizzy drink. For £19.99 they are a steal.

Got a pair on my Solaris. About to put one on the front of my Trance to replace the Ardent. Pretty happy with them, roll a bit slower than the Ardents on the hard pack stuff. But plenty grip on loamy soft stuff.